Why has no one else in reality-dom thought of bringing on Vicki Lawrence and her hilariously lowbrow “Mama?” Just think of it. Mama as a runway coach on “America’s Next Top Model.” (She’d be better than the newbies this cycle.) Mama as a judge on “American Idol.” (She’d straighten out Mariah Carey and Nicki Minaj with a quickness.) Mama as a guest judge on “Project Runway.” ( Mama makeovers!)

First things first. The remaining “All Stars” are still reading Mimi Imfurst and Pandora Boxx for their elimination last week. Mimi didn’t belong there. Pandora gave up. If they truly had worked together, they could have done some serious damage. All sort of true.

The mini-challenge, InDaButtRu (their word not mine), tests the girls on their knowledge of each other. We find out that Yara Sofia wear “pantaletas” under her clothes. Look it up. That Tammie Brown thinks Nina Flowers wears grass underwear. Dear, cuckoo Tammie. That Shannel prefers, ahem, a top bunk. Riiiiight.

Rujubee — Raven and Jujubee — win and get a pie in the face, which gives way to the main challenge: a spin on “Rowan & Martin’s Laugh-In called “Gaff In.” The girls must write jokes, perform sketches as celebrities and interact with Mama. Here’s the breakdown:

Jujubee could have gone 100 different ways, even Nicki Minaj, which Raven shot down. Fran Drescher just seems like a weird fit. Ditto for Alexis, who doesn’t have much material in Shakira. But Nina truly shoots herself in the stiletto, choosing someone most people won’t know and not even bothering to make her funny.

In the workroom, Yara rehearses her jokes. I can’t understand a word she’s saying, and when I do, I still don’t get much. But it’s hilarious for some reason. I seriously rewound and laughed more than once. Tammie is still on her own planet, claiming she’ll portray a Tammy Faye who doesn’t tell jokes. All right, girl. Whatever you say.

Manila’s gap-toothed Madonna is a standout. Chad also gets praise from the judges for his eerily accurate Bette Davis. He’s got the look and voice down, but is it funny? Not really? Ditto for Shannel’s Lucy. Those two queens take themselves WAY too seriously to truly be funny. I’m all but done with them.

Shakira, Mama and Charo. (Logo)

Yarlexis manage a genuine chemistry, charm and humor in their bits. And I do sort of love Raven’s Bea Arthur, if only for the moment she quips “Put it in me” before a pie in the face.

The runway is an homage to ’60s glam, of course. I HATE SHANNEL’S ENTIRE LOOK. It’s wrong in every way. The wig, the dress, the colors. Gurl, it’s all too young for you. The judges love Rujubee’s mod dresses, but no one clocks Jujubee’s for being too long. It makes her look even shorter than she is.

But Michelle Visage does take the time to point out Manila’s white eye makeup, which makes her look cross-eyed. MAYBE THAT’S WHAT SHE WAS GOING FOR, MICHELLE. YOU DON’T KNOW EVERYTHING.

Yarlexis wins the night, largely thanks to Yara’s kooky Charo. Teams Latrila (n0!) and Brown Flowers (n0!) land in the bottom, with Latrice lip-syncing against Tammie to some Ethel Merman. They both give it their all, but it’s obvious who’s packing it up. Latrila is going nowhere this early. (It should have been Team Shad in the bottom again.)

Sad. Back to Planet Tammie, where the tiger lilies bloom and the clams are happy.